[Skimmertalk] red pitaya, for real?

[kazeringue at aol.com]

Good information.

Makes sense, AMD seems to like to push the floating point stuff to the 
gpu, graphics normally being the usual high volume fpu user in most 
situations.  Certainly for their target budget gaming market.  Probably 
helps them cut costs on the CPU's.  Seems like I read they are going 
back to 1:1 with the next[?current?] line.

Not looking for a rtty skimmer anytime soon, especially if I need a late 
generation i7 to run it.  Just looking for an affordable softrock 
alternative for CW skimming the contest bands during the season.

So the general consensus is:
RTTY skimmer, more cpu horsepower, i7 best bet.
CW skimmer, more horsepower best, but possible to get by with less if 
willing to live with load(or other compromise).

73 de w4kaz




> Do NOT use an AMD uP if RTTY skimmer duty is what you want.  This program is
> a monster consumer of FPU calculation capability and while the AMD parts are
> very fast, they suffer from a shared FPU core.  Meaning your zippy new AMD
> 8-core speed deamon actually has only 4 FPU cores, and they are shared one
> FPU to two CPU.  My rather ancient and slow (by modern standards) 945 runs
> around 300 decoders under RTTY skimmer despite being "only" a 4-core part.
> That's about the same speed as you get out of the later AMD parts.  Why?
> Because the 945 has a single FPU for each CPU.
>
> The Intel parts by comparison are faster because there is a 1:1
> correspondence between physical CPU and physical FPU cores.